Types of CF

In article <[email hidden]>,

Kenny Lee said:

Does anyone know the differences in CF? Several people in our group have gone and purchased CF
bike frames made by Giant. On a C40 the CF is encased in clear coat to protect the CF. On the
Giant frames there isn't any clear coat. The Giant bikes has what appears to be a pattern of woven
man-made material but the surface is smooth to the touch similiar to 'hard' plastic. When first
noticing this difference several of us asked our 'insider' who works at Giant to take us on a tour
of their CF frame manufacturing plant. He tells us even he doesn't have acess to this area.
Hearing this just makes me more curious. Can anyone enlighten me?

Thanks, Kenny Lee

Carbon Fibre is basically fibreglass matting, except the heavy glass in the mat has been replaced
with very light carbon fibres.

Basic CF technology involves laying up the matting in layers, and then pouring the (clear) epoxy
over the matting. It hardens, forming a composite consisting of a hard resin holding the strong
carbon in place. The hard plastic you feel is basically just what it looks like.

There are complications: better parts are vacuum-formed, and you often have to build up parts one
layer at a time, but the basic composition of CF matting encased in hard resin never changes.

--
Ryan Cousineau, [email hidden] sfu.ca~rcousineOpen ↗ President, Fabrizio Mazzoleni Fan Club

Well almost right what you see on the giant is most likely just the outermost layer which is a woven
layer or cloth the inner layers are very likely unidirectional or all the fibers running in one
direction this is placed at various angles to achieve the strength in the desired direction on the
trek's all the layers are unidirectional the carbon fiber is also most likely prepreg this has the
resin already in the fiber so each layer you put down is fully wet out and you don't have any dry
spots or voids there could be any number of layers depending on the strength required and the
thickness of the individual ply's this is then vacuum bagged or compressed to compact the layers.

Pete

"Ryan Cousineau" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

In article <[email hidden]>,

Kenny Lee said:

Does anyone know the differences in CF? Several people in our group have gone and purchased CF
bike frames made by Giant. On a C40 the CF is encased in clear coat to protect the CF. On the
Giant frames there isn't any clear coat. The Giant bikes has what appears to be a pattern of
woven man-made material but the surface is smooth to the touch similiar to 'hard' plastic. When
first noticing this difference several of us asked our 'insider' who works at Giant to take us
on a tour of their CF frame manufacturing plant. He tells us even he doesn't have acess to this
area. Hearing this just makes me more curious. Can anyone enlighten

me?

Quoted message said:

Quoted message said:

Thanks, Kenny Lee

Carbon Fibre is basically fibreglass matting, except the heavy glass in the mat has been replaced
with very light carbon fibres.

Basic CF technology involves laying up the matting in layers, and then pouring the (clear) epoxy
over the matting. It hardens, forming a composite consisting of a hard resin holding the strong
carbon in place. The hard plastic you feel is basically just what it looks like.

There are complications: better parts are vacuum-formed, and you often have to build up parts one
layer at a time, but the basic composition of CF matting encased in hard resin never changes.

--
Ryan Cousineau, [email hidden] sfu.ca~rcousineOpen ↗ President, Fabrizio Mazzoleni Fan Club

both very good answers

"Pete Russell" <[email hidden]> wrote in message "]news:[email hidden]...
Well almost right what you see on the giant is most likely just the outermost layer which is a woven
layer or cloth the inner layers are very likely unidirectional or all the fibers running in one
direction this is placed at various angles to achieve the strength in the desired direction on the
trek's all the layers are unidirectional the carbon fiber is also most likely prepreg this has the
resin already in the fiber so each layer you put down is fully wet out and you don't have any dry
spots or voids there could be any number of layers depending on the strength required and the
thickness of the individual ply's this is then vacuum bagged or compressed to compact the layers.

Pete

"Ryan Cousineau" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

In article <[email hidden]>,

Kenny Lee said:

Does anyone know the differences in CF? Several people in our group have gone and purchased CF
bike frames made by Giant. On a C40 the CF is encased in clear coat to protect the CF. On the
Giant frames there isn't any clear coat. The Giant bikes has what appears to be a pattern of
woven man-made material but the surface is smooth to the touch similiar to 'hard' plastic. When
first noticing this difference several of us asked our 'insider' who works at Giant to take us
on a tour of their CF frame manufacturing plant. He tells us even he doesn't have acess to this
area. Hearing this just makes me more curious. Can anyone enlighten

me?

Quoted message said:

Quoted message said:

Thanks, Kenny Lee

Carbon Fibre is basically fibreglass matting, except the heavy glass in the mat has been replaced
with very light carbon fibres.

Basic CF technology involves laying up the matting in layers, and then pouring the (clear) epoxy
over the matting. It hardens, forming a composite consisting of a hard resin holding the strong
carbon in place. The hard plastic you feel is basically just what it looks like.

There are complications: better parts are vacuum-formed, and you often have to build up parts one
layer at a time, but the basic composition of CF matting encased in hard resin never changes.

--
Ryan Cousineau, [email hidden] sfu.ca~rcousineOpen ↗ President, Fabrizio Mazzoleni Fan Club

ajames54 <[email hidden]> wrote in message <snip>

Quoted message said:

Quoted message said:

There are complications: better parts are vacuum-formed, and you often have to build up parts one
layer at a time, but the basic composition of CF matting encased in hard resin never changes.

Anyway there are a couple of different ways to make the parts, and even the entire bike none of
them are particularly secret or difficult to understand. The methods can all be found in a good
library and the materials can be purchased in most major metropolitan areas ... Hell if you had a
two or three thousand bucks lying around you could set yourself up in your garage! Giant may have
some sort of clean room policy in effect but that is about the only reason I can see for
restricting access ...well other than the fact that tourists are a PITA.

Heck, if you want to try it yourself, STFW: sheldonbrown.comcarbon fiber.htmOpen ↗

As to the original poster's description of the appearance of some frames, there's also the
possibility of the carbon-fiber being interwoven with another material, such as Kevlar. This will
yield a distinctive black/gold weave. Carbon/kevlar fabric is available from a couple sources:
shopmaninc.comhybrids.htmlOpen ↗ among them.

Jeff